package com.dailywork.basepro.thread.concurrent.concurrent;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.locks.StampedLock;

/**
 * @author Benjamin Winterberg
 */
public class Lock5 {

    public static void main(String[] args) {
        ExecutorService executor = Executors.newFixedThreadPool(2);

        StampedLock lock = new StampedLock();

        executor.submit(
                () -> {
                    long stamp = lock.tryOptimisticRead();
                    try {
                        System.out.println("Optimistic Lock Valid: " + lock.validate(stamp));
                        ConcurrentUtils.sleep(1);
                        System.out.println("Optimistic Lock Valid: " + lock.validate(stamp));
                        ConcurrentUtils.sleep(2);
                        System.out.println("Optimistic Lock Valid: " + lock.validate(stamp));
                    } finally {
                        lock.unlock(stamp);
                    }
                });

        executor.submit(
                () -> {
                    long stamp = lock.writeLock();
                    try {
                        System.out.println("Write Lock acquired");
                        ConcurrentUtils.sleep(2);
                    } finally {
                        lock.unlock(stamp);
                        System.out.println("Write done");
                    }
                });

        ConcurrentUtils.stop(executor);
    }
}
